What is VoIP?

Mark Gibbons

18 July 2019 20:51

Updated

Voice over Internet Protocol (VoIP) is the transmission of voice traffic over an IP-based network such as the Internet. The Session Initiation Protocol (SIP) is the signalling protocol widely used as a VoIP standard for creating and controlling communication sessions.

A VoIP-enabled device can make or receive calls using SIP by connecting to an Internet Telephony Service Provider (ITSP) such as babyTEL. VoIP calls to and from telephone numbers on the traditional Public Switched Telephone Network (PSTN) including Mobile numbers are possible by connecting through an ITSP.